select open spline knots

Just sharing some code I already inside of other scripts for someone that asked. This is really basic maxscript that will loop through your selection and select at sub-object vertex level any "open" vertices. No error checking, lots of situations that will break it. (Selecting objects that aren't "editable spline", even a circle primitive will error.) If you have multiple objects selected, it maintains that selection, but if you select just one of them and go into subobject, your verts will be selected. Just a starter for folks to use. I may have gotten this code from somewhere else, I'm honestly not sure but I couldn't find it anywhere after some searching so thought I'd post up here.